46 CFR § 30.10-6a - Category A machinery space—TB/ALL.

---
identifier: "/us/cfr/t46/s30.10-6a"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 30.10-6a - Category A machinery space—TB/ALL."
title_number: 46
title_name: "Shipping"
section_number: "30.10-6a"
section_name: "Category A machinery space—TB/ALL."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "D"
subchapter_name: "TANK VESSELS"
part_number: "30"
part_name: "GENERAL PROVISIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2103, 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGFR 65-50, 30 FR 16657, Dec. 30, 1965, unless otherwise noted."
cfr_part: "30"
---


# 30.10-6a Category A machinery space—TB/ALL.

The term *Category A machinery space* means any space and trunks and ducts to such a space that contains:

(a) Internal combustion machinery used for main propulsion;

(b) Internal combustion machinery used for purposes other than main propulsion where the total aggregate power is at least 500 brake horsepower;

(c) Internal combustion machinery that uses a fuel that has a flash point of less than 43.3°C (110°F); or

(d) One or more oil fired boilers or oil fuel units.

[CGD 74-127, 41 FR 3842, Jan. 26, 1976]